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  2. No. 4 Electronic Switching System - Wikipedia

    en.wikipedia.org/wiki/No._4_Electronic_Switching...

    Two-wire and 4-wire voice-frequency trunks terminating at metallic terminal facilities and equipment which provides an interface between digital carrier equipment and the 4ESS switching network. The switching network contains the equipment which actually switches pulse code modulated data from one trunk or service circuit to another.

  3. Four-wire circuit - Wikipedia

    en.wikipedia.org/wiki/Four-wire_circuit

    In telecommunications, a four-wire circuit is a two-way circuit using two paths so arranged that the respective signals are transmitted in one direction only by one path and in the other direction by the other path. The four-wire circuit gets its name from the fact that is uses four conductors to create two complete electrical circuits, one for ...

  4. Transfer switch - Wikipedia

    en.wikipedia.org/wiki/Transfer_switch

    Simplified single line diagram of a single-phase transfer switch to select either 'city' (utility) power or local generator power 3-phase Intelligent transfer switch. A transfer switch is an electrical switch that switches a load between two sources. Some transfer switches are manual, in that an operator effects the transfer by throwing a ...

  5. Three-phase electric power - Wikipedia

    en.wikipedia.org/wiki/Three-phase_electric_power

    A three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line-to-ground voltage because it uses less conductor material to transmit a given amount of electrical power. [3] Three-phase power is mainly used directly to power large induction motors, other electric motors and other ...

  6. Eagle Electric - Wikipedia

    en.wikipedia.org/wiki/Eagle_Electric

    By the early 1980s Eagle Electric was selling thousands of wiring device SKUs to hardware stores across the country. In 1991 Eagle Electric, under the leadership of the Advertising Director, introduced a line of surge protector wiring devices under the brand eSmart, with the strong support of senior management. The eSmart brand was the first ...

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  8. Multiway switching - Wikipedia

    en.wikipedia.org/wiki/Multiway_switching

    In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.

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